Tissue cell block



FIG. 1 is a top perspective view of a tissue cell block showing our newdesign; and,

FIG. 2 is a top plan view thereof, the bottom plan view being a minorimage thereof.

Area depicted in dense stippling represents a species of cells differentthan the area depicted in sparse stippling. Area depicted in sparsestippling shows a contrasting opaque background.

CLAIM The ornamental design for a tissue cell block, as shown anddescribed.